i see, the first form uses the GET method, so:
<input type="hidden" value="<?php echo((isset($_POST["Player"]))?$_POST["Player"]:"") ?>" name="PlayID">
should be:
<input type="hidden" value="<?php echo((isset($_GET["Player"]))?$_GET["Player"]:"") ?>" name="PlayID">
on the second form, change the method to post, the add to cart button will need to have the form sent using the post method instead of the get method.